Serge Bazanski | c611864 | 2021-01-31 01:17:38 +0100 | [diff] [blame] | 1 | package main |
| 2 | |
| 3 | import ( |
| 4 | "encoding/json" |
| 5 | "fmt" |
| 6 | "io/ioutil" |
| 7 | "net/http" |
| 8 | |
| 9 | "github.com/golang/glog" |
| 10 | "google.golang.org/protobuf/encoding/prototext" |
| 11 | admission "k8s.io/api/admission/v1beta1" |
| 12 | meta "k8s.io/apimachinery/pkg/apis/meta/v1" |
| 13 | |
| 14 | pb "code.hackerspace.pl/hscloud/cluster/admitomatic/config" |
| 15 | ) |
| 16 | |
| 17 | type service struct { |
| 18 | ingress ingressFilter |
| 19 | } |
| 20 | |
| 21 | // newService creates an admitomatic service from a given prototext config. |
| 22 | func newService(configuration []byte) (*service, error) { |
| 23 | var cfg pb.Config |
| 24 | if err := prototext.Unmarshal(configuration, &cfg); err != nil { |
| 25 | return nil, fmt.Errorf("parsing config: %v", err) |
| 26 | } |
| 27 | |
| 28 | s := service{} |
| 29 | |
| 30 | for i, ad := range cfg.AllowDomain { |
| 31 | if ad.Namespace == "" { |
| 32 | ad.Namespace = "default" |
| 33 | } |
| 34 | if ad.Dns == "" { |
| 35 | return nil, fmt.Errorf("config entry %d: dns must be set", i) |
| 36 | } |
radex | e36beba | 2023-10-11 00:41:48 +0200 | [diff] [blame] | 37 | if ad.Regexp { |
| 38 | if err := s.ingress.allowRegexp(ad.Namespace, ad.Dns); err != nil { |
| 39 | return nil, fmt.Errorf("config entry (regexp) %d: %v", i, err) |
| 40 | } |
| 41 | } else { |
| 42 | if err := s.ingress.allow(ad.Namespace, ad.Dns); err != nil { |
| 43 | return nil, fmt.Errorf("config entry %d: %v", i, err) |
| 44 | } |
Serge Bazanski | c611864 | 2021-01-31 01:17:38 +0100 | [diff] [blame] | 45 | } |
| 46 | glog.Infof("Ingress: allowing %s in %s", ad.Dns, ad.Namespace) |
| 47 | } |
Serge Bazanski | c1f3725 | 2023-06-19 21:56:29 +0000 | [diff] [blame] | 48 | s.ingress.anythingGoesNamespaces = cfg.AnythingGoesNamespace |
Serge Bazanski | c611864 | 2021-01-31 01:17:38 +0100 | [diff] [blame] | 49 | return &s, nil |
| 50 | } |
| 51 | |
| 52 | // handler is the main HTTP handler of the admitomatic service. It servers the |
| 53 | // AdmissionReview API, and is called by the Kubernetes API server to |
| 54 | // permit/deny creation/updating of resources. |
| 55 | func (s *service) handler(w http.ResponseWriter, r *http.Request) { |
| 56 | var body []byte |
| 57 | if r.Body != nil { |
| 58 | if data, err := ioutil.ReadAll(r.Body); err == nil { |
| 59 | body = data |
| 60 | } |
| 61 | } |
| 62 | |
| 63 | if r.Method != "POST" { |
| 64 | glog.Errorf("%s %s: invalid method", r.Method, r.URL) |
| 65 | return |
| 66 | } |
| 67 | |
| 68 | contentType := r.Header.Get("Content-Type") |
| 69 | if contentType != "application/json" { |
| 70 | glog.Errorf("%s %s: invalid content-type", r.Method, r.URL) |
| 71 | return |
| 72 | } |
| 73 | |
| 74 | var review admission.AdmissionReview |
| 75 | if err := json.Unmarshal(body, &review); err != nil { |
| 76 | glog.Errorf("%s %s: cannot decode: %v", r.Method, r.URL, err) |
| 77 | return |
| 78 | } |
| 79 | |
| 80 | if review.Kind != "AdmissionReview" { |
| 81 | glog.Errorf("%s %s: invalid Kind (%q)", r.Method, r.URL, review.Kind) |
| 82 | return |
| 83 | } |
| 84 | |
| 85 | var err error |
| 86 | req := review.Request |
| 87 | resp := &admission.AdmissionResponse{ |
| 88 | UID: req.UID, |
| 89 | Allowed: true, |
| 90 | } |
| 91 | switch { |
| 92 | case req.Kind.Group == "networking.k8s.io" && req.Kind.Kind == "Ingress": |
| 93 | resp, err = s.ingress.admit(req) |
| 94 | if err != nil { |
| 95 | glog.Errorf("%s %s %s: %v", req.Operation, req.Name, req.Namespace, err) |
| 96 | // Fail safe. |
| 97 | // TODO(q3k): monitor this? |
| 98 | resp = &admission.AdmissionResponse{ |
| 99 | UID: req.UID, |
| 100 | Allowed: false, |
| 101 | Result: &meta.Status{ |
| 102 | Code: 500, |
| 103 | Message: "admitomatic: internal server error", |
| 104 | }, |
| 105 | } |
| 106 | } |
| 107 | } |
| 108 | |
| 109 | glog.Infof("%s %s %s in %s: %v (%v)", req.Operation, req.Kind.Kind, req.Name, req.Namespace, resp.Allowed, resp.Result) |
| 110 | review.Response = resp |
| 111 | json.NewEncoder(w).Encode(review) |
| 112 | } |